Packing for piston rods and valve stems



'Nov. 18, 1930. s. E. DUNHAM PACKING FOR PISTON RODS AND VALVE STEMSFiled Nov. 24, 1928 2 Sheets-Sheet 1 INVENTOR W BY my 0 ATTORNEY Nov.18, 1930. s. E. DUNHAM PACKING FOR PISTON RODS AND VALVE STEIS FiledNov. 24, 1928 2 Sheets-Sheet 2 Patented Nov. 18, 1930 f UNITED STATES.

1 SAMUEL E. DUNHAMyOFAUGUSTA,"GEORGIA v PACKING non PISTON O S Ann,vrtvsgstms 1 Application filed November 24,: 19289 The object of thisinvention is to provide self seating metallic packing elements, for usein the stuffing box of a piston rod, or under any similar conditions,the elements being assembled in the special manner hereinafterdisclosed. Y r

A further ob ect is to provide, in one rorm,

v an annular element, having beveled lugs, or

transverse extensions on opposite sides adapted to retain in position aplurality of spring held and approximatelysegmental packing elementswhich will have close contact with the piston rod, but permit sufficientfreedom of movement thereof. p I

,With the foregoing and other objects in view, the invention consists inthe novel cone struction and arrangement of elements described,illustrated, and claimed, it being understood that modifications may bemade within the scope of the claim without departing from the spirit ofthe invention.

In the drawings forming part of this ap-' plication Figure 1 is atransverse section thru the stufiing box of a piston rod, the sectionbeing on line 11 of Figure 2. I

Figure 2 is a section diametrically thru the stufling box, and on theline 22 of Figure 1.

Figure 3 is a perspective view of an element on opposite sides of whichthe packing devices Figure 7 is a perspective View of an element servingthe purpose ofthat shown in Figure 3, but being formed of a plurality ofsections having a particular type of connection,

Figure 8 is a perspective view of one of the elements of Figure 7 iFigure 9 is a detail in elevation from the left in Figure 8.

A cylinder head or the like designatedlO Isition die-sired, that.isi1npa"rting thrust in a downward direction in Figure 2.

placed within the sleeve-or lining 13 of Figof Figure 1, the lowerelements of Figure 2 looking semis; 521,723. I A I is formedwithwalls llenclosing thestufiing i box 12,1the latter having therein a lining orsleeve13, and the stuffingbox being closedby plate 14 having a centralopening for the accommodationo'f the pistonrod15. Stud bolts .55

16 are secured by nuts 17, in a'mor'e-or less conventional manner. f i iH Within the-stuffing box is the coiled spring 18 surrounding the pistonrod 15 andtending to hold the elements of the packing in the po- Spring18-contacts With a plate or h ring member 19, and.below,the latter is aparticular form'of spacing and ring retaining element, such asithatshownin Figure 3, wherein the plate port onis designated 20, and lugs orextensions 21 are positioned on one side of the plate, in opposite relaton, and other similar devices 22am positioned on the opposite side, andthe central portions of these devices, 21 and 22 are at an angle ofapproximately degreespproviding the spacing indicated in .F su

":The several plates of Figure 2 may be termed disks, and the. lugs ofdisk 20 are preferably bevelled, By the use of this device 20, includingthe lugs or extensions 21 and 22, the whole being ure 2-,, I am enabledto satisfactorily position upper and lower packing'rings, each includinga plurality of; elements such as 26L and% being however designated 24:and 25. The .saidmetalpacking elements are so proportioned that theywill have edges tending to wedge the rings slightly with reference toeach other, causing them to grip a piston rod,

to a reasonable extent, but permitting the required reciprocatingmovement of the latter.

The rings are mounted between the elements 21.011 one side of the plate20 and the elements 22.;onithe other side ;thereofand in each instanceare held by springs such as 26,

urging the ring elementsltoward the center of the stufiing box andtherefore into contact v with the piston rod. A lower annular plate 28is shown in Figure 2 and serves an obvious purpose in connection withthe mounting of the lower pair of packing ring elements.

In the modification shown in Figure 5, the piston rod is designated asbefore, and the latter is surrounded by a spring 18 hearing on an upperplate 30. r The packing elements .are

positioned between plate and the lowor p ate 31, and the pairs ofpacking elements are separated by plate '32. The elements of 34, and 36,and springs bearing on the the individual rings are designated 33 andupper pair of elements are designated 37.

Figure 6 shows a ring 38 adaptedto receive a pair of segmental elementsof the form shown for instance in Figure 4, wherein each element 39 isprovided with a cut away portion formingra shoulder at 40, theshouldered portion, in each instance, engaging an inwardly extendinglug41, a pair of these lugs being oppositely located Within the ring 38.Wherever required the separating plates may be split as indicated at 42in Figure 10, this 1,

plate being designated 43.

. Lugs 41, and lugs such as 45, form elongated lips remote from thecenter,'and provide a chord-like reinforcement of the edge portions ofthe element or elements carrying I these lugs.

In Figure 7 is will be observed that the plate member carrying the lugsis formed in a plurality of sections, th-isdevice'corresponding infunction with that shown in Figure 3.

The section 44 includes a lug 45, and section.

46 includes a lug 47element 45 further including a lugor extension 48,and the extension 49 is oppositely located'asindicated in Figure 7 Pins50 and 51 pass thru the'sec- I tions and are adapted to engageshouldered portions such as the shoulder 53 of Figure 8, it beingunderstood that the pins project from end portions of the sectionslocated approximately diametrically opposite each other. The separatingand guiding member formed in this manner is capable of use under specialconditions where the device shownin Figure 3 is not soreadily handled,and the elements of the packing rings will cooperate with the structureof Figure 7 in the same manner as with that of Figure 3.

Having described thefinvention what is claimed is In a device of theclass described, a pack ing ring comprising a plurality of segmentalsections each having a fiat edge portion, re-

silient means bearing on the outer edges of the sections, a diskadjacent to which the sec tions are mounted, said disk and sections be-7 ing adapted to surround a rod, and lugs car- ,ried by the diskandpositioned at points opposite each other, for engaging the edge portionsof the sections, said lugs forming elongated lips remote from the centerand constituting chord reinforcements of the edge portions of the disks. E. DUNHAM.

